The '''Sun''' is the star
at the center of the Solar System
. It is a nearly perfect sphere of hot plasma (physics)|plasma
with internal convection|convective
motion that generates a magnetic field
via a Solar dynamo|dynamo process
It is by far the most important source of energy
. Its diameter is about 109 times that of Earth, and Solar mass|its mass
is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System.
About three quarters of the Sun's mass...